Measure the two dimensions (length and width) of the space we are interested in covering with pebbles or chippings. Multiply the length by the width and find the square meters. Then calculate the height you want the material to cover.
If you use relatively thin pebbles, a height level of 4-5 points is enough. If you want to use thicker material, e.g. 6-7 cm, then you will need a height level of at least 10 points to have an aesthetically pleasing result.
Therefore, after calculating the height, express it in metres. That is, a height level of 5 cm is expressed as 0.05 meters. Multiply the square metres by the height and find the cubic metres, e.g. 10 metres long x 7 metres wide = 70 sq.m. x 0.06 metres high = 4.2 m3. To convert cubic metres to tons, multiply by the specific weight of the material to be used. The specific gravity of most materials, with a few exceptions, is about 1.5. So, for 4.2 m3 x 1.5, you will need 6.3 tons.